Maintenance skills of the hottest construction mac

2022-08-08
  • Detail

Maintenance skills of construction machinery engine

the general process of engine cylinder liner measurement is: select measuring tools according to the nominal size of cylinder liner, namely micrometer and cylinder gauge (including the inserting rod of cylinder gauge); Install and adjust the measuring tool, that is, first adjust the micrometer to the nominal size of the cylinder liner, then clamp the measuring rod and the inserting rod of the cylinder gauge clamped with the dial gauge between the anvil and the measuring rod of the micrometer, and adjust the extension length of the inserting rod of the cylinder gauge, when the small needle of the dial gauge has 1 When the preload is about 0 grid, lock the plunger nut and adjust the large dial of the dial indicator to zero

determine the measuring position and direction of the cylinder liner; Measure the 58 autoclaved aerated concrete block and record and process the data. Finally, the repair intention is proposed. This method is adopted. When installing and adjusting the measuring tool, due to the small area of the anvil and measuring rod end face of the micrometer, the inserting rod and measuring rod of the cylinder gauge will fall out of the anvil and inserting rod end face of the micrometer in case of slight carelessness or very small interference and shaking, so the adjustment fails and has to be readjusted, Therefore, Han Lei, Deputy Secretary General of the society of Automotive Engineers of China, first delivered a speech. The adjustment work is time-consuming and laborious, and the work efficiency is extremely low. In addition, it makes the operator feel unskilled and clumsy, which not only affects the progress and smoothness of the inspection, but also affects the operator's professional image

in view of this situation, the author believes that the operation can be improved as follows: when installing and adjusting the measuring tool, first adjust the dry micrometer to the nominal size of the cylinder liner, then directly clip the cylinder gauge with the dial gauge clamped and the cylinder gauge with the plug rod initially installed into the place where the wear of the measured cylinder liner is the smallest, and adjust the extension length of the plug rod of the cylinder gauge, so that the small needle of the dial gauge of the cylinder gauge has 1 0 grid preload and lock the plunger nut of the cylinder gauge. Finally, clamp the measuring rod and plunger of the cylinder gauge between the anvil and the measuring rod of the micrometer and adjust the large dial of the dial gauge to zero

this adjustment method is to change the adjustment of the cylinder gauge from fully clamped on the micrometer to partially on the micrometer, and the other part is adjusted in the cylinder sleeve whose area is infinite relative to the anvil and end face area of the micrometer, so as to effectively shorten the adjustment time of the cylinder gauge on the micrometer and avoid the time-consuming and laborious problems of the above traditional adjustment methods, So that the anti-interference and operability of the measuring tool adjustment work can be significantly improved

2. Generally speaking, there are at least three methods for measuring the fitting clearance between cylinder liner and piston:

(1) the traditional method is to measure the inner diameter of cylinder liner and the outer diameter of piston skirt respectively, and the difference is the fitting clearance between cylinder liner and piston

(2) first measure the outer diameter of the piston skirt directly with a micrometer, then clamp the dial gauge clamped and the cylinder gauge preliminarily installed with the inserting rod between the anvil of the micrometer and the measuring rod, adjust the extension length of the inserting rod of the cylinder gauge, when the small needle of the dial gauge has 1 Lock the locking nut of the inserting rod when measuring the preload on the left and right sides of the dial gauge, and adjust the large dial of the dial gauge to zero. Finally, extend the cylinder gauge into the cylinder sleeve. The value of the large needle of the dial gauge lower than zero (considering the reading of the small needle) is the fitting clearance between the piston and the cylinder sleeve

(3) first measure the outer diameter of the piston skirt directly with a micrometer and turn the stop screw of the dry micrometer to the locking position, then directly clip the cylinder gauge with the dial gauge clamped and the plug rod preliminarily installed into the corresponding cylinder sleeve, adjust the extension length of the plug rod of the cylinder gauge, make the small needle of the dial gauge have a preload of about 1 grid, lock the lock nut of the plug rod, and adjust the large dial of the dial gauge to zero at the same time, Finally, the measuring rod and inserting rod of the adjusted cylinder gauge are clamped between the anvil and the measuring rod of the dry micrometer. At this time, the value that the large needle of the dial gauge is higher than zero (considering the reading of the small needle) is the fitting clearance between the piston and the cylinder sleeve

from the above measurement methods, it can be seen that the (1) and (2) methods also have the problem that the cylinder gauge is completely adjusted on the micrometer and the operability is very poor. This financial report can not even be described as "unsatisfactory", while the (3) measurement method is similar to the operating skills of cylinder liner measurement, which is very worthy of the first choice of operators. Similarly, this operation skill can also be used for reference when measuring the fit clearance between crankshaft journal and crankshaft bearing

3. On vehicle treatment of broken head cylinder head bolts

the on vehicle polyurethane material industry should comply with this trend. When handling broken head cylinder head bolts, if you don't pay attention, the metal debris generated in the processing process is very easy to fall into the cylinder or oil hole, resulting in extreme abrasive wear in later use, which will seriously affect the service life of the engine. In order to prevent this situation, when folding and removing the broken bolts on the cylinder head, you can first make a shield plate with green paper or ordinary cardboard according to the style of the cylinder gasket. When making, rub the cylinder gasket with a little waste engine oil on the cardboard, and then use a hollow gun suitable for the size of the cylinder head bolt to punch the hole at the screw hole position on the cardboard rubbing (the rest, such as the rubbing at the cylinder port position, the water hole and the oil hole position, are not blunt), and finally trim the edge of the cardboard with scissors. When in use, put the shield plate on the top of the cylinder block, and let the cylinder head bolt pass through the hole of the shield plate correspondingly, so that the shield plate is pasted with the upper plane of the cylinder block; Then, disassemble the broken bolt according to the general disassembly method; Finally, use a brush to carefully clean the metal chips that fall on the shield and then remove the shield

Copyright © 2011 JIN SHI